board: ti: j721s2: Set fdtfile from C code instead of findfdt script

We now can provide a map and have the standard fdtfile variable set from
code itself. This allows for bootstd to "just work".

While at this, replace findfdt in environment with a warning as it is no
longer needed.

Reviewed-by: Jonathan Humphreys <j-humphreys@ti.com>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Signed-off-by: Nishanth Menon <nm@ti.com>
diff --git a/board/ti/j721s2/evm.c b/board/ti/j721s2/evm.c
index 1220cd8..5a0281d 100644
--- a/board/ti/j721s2/evm.c
+++ b/board/ti/j721s2/evm.c
@@ -23,6 +23,7 @@
 #include <dm/root.h>
 
 #include "../common/board_detect.h"
+#include "../common/fdt_ops.h"
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -114,6 +115,12 @@
 	return 0;
 }
 
+static struct ti_fdt_map ti_j721s2_evm_fdt_map[] = {
+	{"j721s2", "k3-j721s2-common-proc-board.dtb"},
+	{"am68-sk", "k3-am68-sk-base-board.dtb"},
+	{ /* Sentinel. */ }
+};
+
 static void setup_board_eeprom_env(void)
 {
 	char *name = "j721s2";
@@ -131,6 +138,7 @@
 
 invalid_eeprom:
 	set_board_info_env_am6(name);
+	ti_set_fdt_env(name, ti_j721s2_evm_fdt_map);
 }
 
 static void setup_serial(void)